83 lines
3.7 KiB
Python
83 lines
3.7 KiB
Python
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# test_chacha20poly1305.py
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#
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# Copyright (C) 2022 wolfSSL Inc.
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#
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# This file is part of wolfSSL. (formerly known as CyaSSL)
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#
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# wolfSSL is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# wolfSSL is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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# pylint: disable=redefined-outer-name
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from wolfcrypt._ffi import lib as _lib
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if _lib.CHACHA20_POLY1305_ENABLED:
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import pytest
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from wolfcrypt.utils import t2b
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from wolfcrypt.exceptions import WolfCryptError
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from binascii import unhexlify as h2b
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from wolfcrypt.ciphers import ChaCha20Poly1305
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def test_encrypt_decrypt():
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key = h2b("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
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iv = h2b("070000004041424344454647")
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aad = h2b("50515253c0c1c2c3c4c5c6c7")
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plaintext = h2b("4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e")
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expected_ciphertext = h2b("d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116")
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expected_authTag = h2b("1ae10b594f09e26a7e902ecbd0600691")
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chacha = ChaCha20Poly1305(key)
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ciphertext, authTag = chacha.encrypt(aad, iv, plaintext)
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assert ciphertext == expected_ciphertext
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assert authTag == expected_authTag
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decrypted = chacha.decrypt(aad, iv, authTag, ciphertext)
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assert decrypted == t2b("Ladies and Gentlemen of the class of '99: If I could offer you only one tip for the future, sunscreen would be it.")
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def test_invalid_key_size():
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with pytest.raises(ValueError):
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ChaCha20Poly1305(b"tooshort")
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def test_encrypt_invalid_iv_length():
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key = h2b("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
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chacha = ChaCha20Poly1305(key)
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with pytest.raises(ValueError):
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chacha.encrypt(b"aad", b"short", b"plaintext")
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def test_decrypt_invalid_iv_length():
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key = h2b("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
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chacha = ChaCha20Poly1305(key)
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with pytest.raises(ValueError):
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chacha.decrypt(b"aad", b"short", b"\x00" * 16, b"ciphertext")
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def test_decrypt_invalid_tag_length():
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key = h2b("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
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chacha = ChaCha20Poly1305(key)
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with pytest.raises(ValueError):
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chacha.decrypt(b"aad", b"\x00" * 12, b"short", b"ciphertext")
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def test_decrypt_bad_tag():
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key = h2b("808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f")
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iv = h2b("070000004041424344454647")
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aad = h2b("50515253c0c1c2c3c4c5c6c7")
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plaintext = b"hello world"
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chacha = ChaCha20Poly1305(key)
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ciphertext, authTag = chacha.encrypt(aad, iv, plaintext)
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bad_tag = b"\x00" * 16
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with pytest.raises(WolfCryptError):
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chacha.decrypt(aad, iv, bad_tag, ciphertext)
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